The Revo®-Spec Torque-Control slipper clutch upgrade kit fits T-Maxx® Classic, S-Maxx, and SportMaxx trucks equipped with the original T-Maxx style black transmission. It features efficient semi-metallic friction pads and allows for spur gear replacement without altering the slipper clutch setting. Kit includes everything needed for the conversion, along with complete instructions and parts exploded views.